Trolley



T. S. PUKERUD.

TROLLEY.

APPLICATION FILED JAN. 10. 1916.

1,352,474. j PfifentedSept. 14,1920.

WITNESSES: F' 4 INVENTOR Thomas 5. Puke/"uni.

2 BY I ATTCSRNEY pairs!) STATES PATENT 'orrlcs.

THOMAS S. PUKERUD, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIG AND MANUFACTURING COMIANY, A CORPORATION OF PENN- SYLVANIA.

TROLLEY.

Specification of Letters Patent. Pgttfited Sept. 1-1, 1920.

Application filed January 10, 1916. Serial No. 71,184.

T 0 all whom it may concern:

Be it known that I, THOMAS S'PUKERUD, a citizen of the United. States, and a resident of WVilkinsburg, in the county of Allegheny and State of Pennsylvania, have in vented a new and useful Improvement in Trolleys, of which the following is a specification.

My invention relates to trolleys and particularly to pantograph trolleys such as are commonly employed for, collecting relatively large amounts of current from trolley conductors.

One object of my invention is to provide a current-collecting device of the above-indicated class that shall be simple and durable in construction, effective and reliable in operation and particularly adapted to effect good electrical engagement with a trolley conductor. 7

Another object of my invention is to provide a pantograph trolley having a currentcollecting member that is adapted for engagement with a trolley conductor in which the arrangement of parts is such that the current-collecting member is loosely and resiliently associated with the pantograph frame.

Figure 1 of the accompanying drawing is side view, partially in section and partially in elevation, of a device constructed in accordance with my invention and shown with the pantograph trolley in the lowest or inoperative position thereof. Fig. 2 is a similar view of the device with the panto graph in a raised position. Fig. 3 is an end view, partially in elevation and partially in section on the line IIIIII of Fig. 2, of the device shown in Fig. 2. Fig. 4 is a side view, partially in section and partially'in elevation, of a modified form of my invention.

Referring to the drawing, the device shown comprises a pantographic' supporting frame 1 and a current-collectingdevice 2 which is resiliently associated therewith by a plurality of link members 3 and spring members 5.

The pantographic frame 1 may be of'any well-known construction and, since this type of mechanism is well-known to those skilled in the art, a detailed description thereof is deemed unnecessary. However, such a panraphic frame preferably embodies a pluof rod or tube members 7 whlch are construction.

Each of the rod members 7 is provided -with a removably mounted collar member 10 which is secured thereto and constitutes a stopfor the spring 5, and with a rigidly secured collar member 11 which constitutes a shoulder toward which the movably related link member 3 is biased by the spring 5.

The link members 3 are crossed and each of them has one end curved and aperturcd to receive a pin member 12 by which it is pivotally joined to the current-collecting member 2. The otherend 13 of each link member is bent at substantially right angles to its body portion and is perforatedto re ceive the rod member ,7.

Fig. 4 shows a modified form of my invention in which a single spring is used. Each of the crossed link members 3is provided with an apertured portion A which is slidably associated with the corresponding rod member 7 by means of a pin member 15 the outer end of which is provided with a head to retain the link member in place.

The slotted portions 14 of, the link members 3 are provided with downwardly and outwardly projecting portions 16 to which the ends of a spring 17 are secured. The structure is otherwise the same as that illustrated in Figs. 1, 2 and 3.

If such a device as I have herein described receives a vertical blow, such, for example, as would be caused by sudcenly raising the structure to engage a trolley conductor, the

member 2 will transmit the force of the blow through the link members to the spring or springs which will cushion the shock. and thus minimize the hammering action upon both the trolley conductor and the currentcollector. Ahorizontal blow, such as would. be dealt the moving current-collectorby an obstruction on the trolley conductor, will be transmitted directly to one of the springs by the corresponding link and will cause the current-collector 2 to -move to a lower position.

It will therefore be seen that, with a device asI have described, the resiliently mounted current-collecting member 2 will be end thereof is of like" of comparative y light weight and of small inertia which will permit it to respond quickly to blows or to sudden variations in the height of the trolley conductor. Attention should be directed to the fact that the spring members 5 directly receive vertical blows with a minimum of frictional resistance and that horizontal blows are transmitter directly to one spring and are partially absorbed by the inertia of the currentcollecting member 2.

Although I have described my invention in a simple and preferred form, it is not necessarily so limited, and l desire, thcrc tore, that only such limitations shall be imposed as are indicated in the ap iended tlziims.

I claim as my invention:

1. The combination with a pantograph .lrame and a current-collecting member, of

a plurality of crossed link men'ibers for mounting: the cuwent-collecting member upon said frame.

2. The combination with a pantograph frame and a crrent-collecting member, of a plurality oi crossed link members for supporting the current-collecting member upon aid frame, and resilient means associated with said frame and said link members for maintaining the current-collecting member in its operative position.

3. The combination with a pantograph frame and a current-collecting member, of a plurality of crossed linl: members each of which has one end pivotally connected to one side of one end of the current-collecting iember and the other end slidably connected to said frame, and resilient means for biasing said linlrs toward their uppermost positions.

l. The combination with a pantograph frame comprising a plurality oi rods and a current-collecting member, of a plurality of crossed link members each of which has one end pivotally joined to the current-collecting member and has a portion at the other end thereof bent and apertured to receive one of said rod members, and resilient means biasing said link members toward their uppermost positions.

5. The tombination with a pantograph frame and a current-collecting member, cl a plurality of crossed link members each of which slidably and resiliently engages said frame, at one of its ends, and is pivotally secured, at its other end, to a point on the current-colierting member, said plurality of crossed link members acting as the only support for the current-collecting member.

In a trolley, the combination of a pantograph ttr-ame romprising pivotally connected members, a rurrent collect r, and means for connecting said collector to said frame below said pivotal connection and so that the collector shall move vertically when said frame is raised and lowered, and means tending to raise the frame and collector to an operative position.

In testimony whereof, I have hereunto subscribed my name this 31st day of Dec,

THOMAS S. PUKERUD. 

